<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>ffgf </title>
	<style type="text/css">
#div1{
	width: 300px;
		height: 300px;
		background-color: cyan;
	border-left: 5px solid red;
}

	</style>
</head>
<body>
	<div id="div1"></div>
</body>
</html>